Each bar is wrapped in cellophane, which are then wrapped in the normal outer packaging. To make the 4 pack, they simply took 2x two packs and put them on a cardboard tray,and then wrapped those.
I don’t think I’ve ever gone through so much unwrapping for candy.
Kit Kat’s were in foil with a paper wrapper.
I bought some recently and was dismayed to see they were now in plastic as well.
I’m 38 and had to think real hard to remember when they had the foil wrapper and paper sleeve.